Himiko is a very cheerful girl, to the point of smiling even after having presumably killed someone, displaying apparent sadistic tendencies Even when danger is imminent, as when Tomura Shigaraki was about to attack her, Himiko continues smiling She's also frequently seen blushing, though seemingly out of excitement rather than embarrassment, giving her a permanent somewhat lovesick look on her face. That said, she has shown that she can easily be embarrassed, when thinks people are coming on to her or when she is naked when copying clothes of the people she has transformed into. She is quite courageous, or at least very confident in her Quirk, as she impersonated an aspiring hero and took part in an exam that gathered multiple students of heroics and pro heroes.

Himiko has stated that she finds life to be difficult and wants to make the world an easier place to live in. She looks up to Stain and sees him as her role model; however, at the same time, she has declared a desire to kill and "become" him.